That looks like a copy or reproduction of a 1g turbo manifold. I'm not sure how much the 1g/2g/evo/whatever manifold is important as far as an upgrade goes. The thing to pay attention to is size out of the head into the manifold, and out of the manifold into the turbine housing. More often than not, I have to port the sh*t out of the turbine housing to have it equal/bigger than the manifold. Keep in mind the way the exhaust flows. You want it smooth without steps or 'walls' to screw up the flow. My current setup has an Evo III GT manifold, which I assume is a hogged out Evo III manifold recasted. It's HUGE compared to my stock 1g manifold. Has the stock 4-bolt turbine housing bolt pattern, but the exit is near 8cm. I had to port the sh*t out of my BEP turbine housing [brick] -and- RRE 7cm gasket just to make the exhaust gasses flow correctly. I can't imagine that manifold bolted to a stock 6cm or even 7cm turbine housing inlet would do anything but do harm unless some serious porting was done.